Electrical ignition apparatus for internal-combustion engines.



AHRINGBR. ELECTRICAL IGNITION APPARATUS-FOR INTERNAL COMBUSTION ENGINES.

' APPLIOATIOKI'ILED AUGJ L 1912 I I 1 ,09 1 ,906, Patented Mar. 31, 1914;

RNOLD zanmsem, or STUTTGART, GERM NY, ASSIGNOR TO rma! or noBEnr'BoscH, or srnrrennr, GERMANY.

ELECTRICAL IGNI'rroN arrana'rrrsron mrnnnaL-comnris'rron ENGINES.

v Specification of Iletters Iatent. Application filed-August 27, 1912-. Serial No. 717,252.

To all whom it may concern a Be it known that I, ARNOLD ZiiHmNonR, engineer, a subject of the Emperor of Ger-- many, residing at and whose address is Hoppenlaustrasse l113*, Stuttgart, Germany, have invented certain new" and useful Improvements in Electrical'lgnition Apparatus for InternaLCornbustion .Engines;-and I do hereby declare the following to ma full, clear, and exact description of. the invention, such as will enable others skilled inthe art to which it a'pperf tains to make and use the same.-

MThe present invention relates to 'apparatus ior automatically-adjusting the period of ignitiondn internal cornbustionengines',

and more particularly to centrifugallyi'op 'erated mechanism arranged to,adjus t the,

period of actuation of the mechanical interru'pt'er, and the distributer if desired, rela tively to the stroke of the engine in accord-' jance'with the speed thereof, without shifting the angular relationfbetween the ignit-ion-eurrent generator and the engine.-

So far as -I amaware, all devices .of this kind heretofore disclosed are arranged to i" angularly displace the armature of the ignition cur-rentgenerator to automatically' -alter. the-period nof'ji'gnitionrelatively to the: stroke ot the engine, In such arrangements, the comparatively large mass of the armature is' angularly displaced, although "the torque to which this mass is subjected is variable throughout eachcycle, si'iddenly reaching a; comparatively large value at each period ofignition. Moreover, the rotatable 'element'of'the' mechanical inter;

rupter and the distributer are usually "coupled tothe generator, "so that-these parts, also are a'ngu1ar1y displaced by the same 1 mechanism. 'In" allthese cases, the Iaiigu-' -larly' s l1ifting mechanism is necessarily of -comparativ'ely large size and, therefore, has the attendant disadvantages, among other 'greaterweight;

thingsjofinoreased ,cost, larger space, and

In accordance with my invention, the gen- ",er'atoris positively coupled-to-the engine,

while, the period of ignition is automaticallyadjusted to accord withthe speed by a "centrifugally I operated mechanism which :angula'rly displaces the interrupter alone, or the interrupter I and the distributer. In thisway, the mass to be shiftedis compara post oilice v "SlIOWIIlg tively uniform torque throughout,- so"that the -sh1ftin mechanism may be of consid' elably sma er size than washeretoforePOs-ff si'e. I

It is immaterial "to the broad idea ein- Patented 31,1914, I

Isobodied in this invention whether the distrib- 'uter, if such is-used be driven separately-- It is also immaterial 'vvhether the rotatable normally stationary part be shifted to larly displace theperiod'ofactuation'of;the cofiperative terminals :to alter the period of ignition relativel to'the stroke of the [enginelin accordanee with' -the speed.

, In the ,accompany n ...drawings,- illustrate ing thepreferred em diment of my en-' H gine, 'Elglll'd'd is an. enlarged side yiew, partly 1n section and partly broke a y mechanical interrupter-driven from the gena distributer driven' from the mechanical interrupter 'pling of Figwl.

the ignition current genia -aw y erator'througha centrifugal coupling, and

and Fig. 2 is a front view',, partly broken away, of the centrifugal cofu l The ignition current generator is Sh OWE," I

as a magneto having a -rotatable armature winding A and stationar .fie'ld'rnagnets B,

The armature is posit'vely vcoupled 'to' an in-i zternal combustion engine, so" as driven .in invariable relation Wlth theeng ine' from g the engine shaft, I

QITh e centrifuga'lly: comprises two arms vc pivoted at ya; to 1 member I; which is fastened, on ".the shaftc of,- the magneto. armature I These pivfotedlj armsswing outwardly inresp0i se tofcen-- trifugalhcti-on 'againsttthe stress of con necti-ngsprmgsal, d, the amount-of their swinging movement-s being I dependent upon the speed of rotation of the shaft its-and con-.

sequent-1y upon the speed of the" engine.

Each arm c is provided with aroller far- "1,1 ranged in a curved slot 9 of; thejdiskuhi- The] disk h' is fastened to therotatable ele- 'ment kiof an ordinary mechanical"inter- -rupt'er, and to the gear 6 which drivesfthe.

"gear Z, thereby rotating the 'interrnpter'fele- 5 ;ment is carrying the cooperative contactsand also the brush m of-the distributer. n.

tively small, and is subjected to a 'comp'ara- The deflecting 'tacts to 'interruptthe circuit of the'armat cam o of the mechanical interrupter is fixed in position and' is adapted to periodically separate thecoeperative conture winding A. In this arrangement, the

r rotatable elements o fthe mechanical interrupter, comprising theinterrupter contacts, are. angularly advanced. relatively to. the shaft a andtherefore Ito the'stroke of the engine as. the: speed increases, the displace" ing fgrce being dependent upon the sum of the-centrifugalforcesacting on the arms 0. During this operation, however, ,the 'angu l'ar relation between the armature A and the :stroke' of the engine is' not changed, and, enerator.

therefore, the ignition current :-should be" capableof producing smtable igj -l litlon currents throughout the adjustable" ator positively coupled thereto, a' mechanical interrupter comprising a rotatable element and a normally stationary element wherein-the rotatable element is driven from the-engine to periodically alter the circuit.

of the Winding of, the jgenerator to produce ignition currents therein, and .cent'rifugally pperated mechanism interposed between the rotatable element ofthe interrupter-and its drivingm-eans to automatically changetheir angular-relation to vary the period of igni Q tion relatively tothe 'stroke of the engine in accordance with the speed; substantially as'described. 1 I

' 2. In combinationwith an-internal combustionengine, an ignition current generator positively coupled thereto, .a mechanical vinterrupter]comprising a normally-fixed deflecting cam and a rotatable element driven. from the engine and adapted to cooperate with the cam t'o'periodically alter I substantially as described.

the circuit of the winding of the generator to produce ignition currents therein, and c'entrifugally operated mechanism interp osedbetween the rotatable interrupter ele{ :ment andits driving-means to automatically change-their angular relation to vary the period of ignition relatively to the. stroke the speed;

' of the engine in accordance with ,3. In combinationwith a. multiple, cylinder internal combustion engine, an lgnition current generator positively coupled, the'reto, a mechanicalinterrupter driven from the engine to periodically alter the circuit of the Winding of the generator toprodnce ignition currents therein, a distributer driven.

from the engine for distributing the-ignispeed of, the

ition relatively to the internal comtion currents to' the cylinders in proper order,- and centrifugally operated mechanism interposed between the-distributer and its driving means to automatically change their angularv relation in accordance with the scribed.v 4. In combination with a. multiple cylinderinternal combustion engine, an ignition current generator positively coupled there:-

engine; substantially as de:

to, a mechanical. interrupterdriven from the engine toperiodically alter the circuit ofthe winding of the generator to produce ignition currents therein, a distributer positively coupled to the interrupterfordis- 'tributing the ignition currents to the cylindersofthe engine in proper order, and

centrifugally operated mechanism inter posed betweenthe interrupter and its driving means to automatically change their angular, relation to vary the period of ignition relatively to the stroke" of the engine in accordancewith the speed, and also to si multaneously change the angular position of the distributer in jaccordancejwith the position of the'interrupter; substantially as described. 3 Y

" 51111 combination with an internal coinbustion engine, an ignition current. generator positively coupled thereto,a mechanical interrupter comprising a rotatable part and a stationary part adapted to cotiperate therewith to periodically alter the circuit of the'winding of the-generatorito produce ignition currentstherein, a coupling memwith, a-coupling member faste'nedto the in.- terrupter to rotate therewith, and centrifugally i operated\ mechanism interposed between saidcoupling members to automatically change their angular relation to vary the eriod of ignition relatively to the stroke of t e engine in accordance with the speedy.

substantially as describedi 6. In combinat on with a multiple-cyltion current I generator fpositively coupled thereto, a mechanical interrupter-compuing arotatablepart and a stationary part adapted-to cotiper-ate therewith to periodi- 'inder internal combustionengine, an ignically alter thecircuitofthe winding of the generator to 'produceignition currents llllBIfGlI1,z3. coupling member fastened to the generator to rotate -therewith,ra coupling member fastened to the rotatable part'of the interrupter, a distributer positivelyocou posed. between the" coupling members to automatically change their angular relation durin the period of ignition in accordance "with t e speed of the engine, and also to simultaneously change the angular Positiqn of pled to the rotatable part of the interrupter i for distributing the ignitioncurrents to the, cylinders of the engine in proper order, and

centrifugallyoperated mechanism inter,-

. 100 ber fastenedto the generator torotate theretatable part of theinterrupter, a pair of 1 pivoted arms connected together by spring mechanism and connected to the coupling members in such manner as to angularly advance the interrupter in the direction of rotation with a force determined by the sum of the centrifugal forces acting on the two arms in order to advance the period of ignition relatively to the stroke of the enginc as the speed increases; substantially as described. a

In testimony whereof I aflix my signature, in presence of two Witnesses.

ARNOLD ZAHRINGER.

Witnesses:

REINHOLD ELWERT, WALTHER STEINCKE. 

